title: Bleeding duodenal ulcer: comparison between Helicobacter pylori positive and Helicobacter pylori negative bleeders.
mesh_terms: D000368:Aged; D016022:Case-Control Studies; D004381:Duodenal Ulcer / Q000150:complications / Q000175:diagnosis / Q000382:microbiology*; D016099:Endoscopy, Gastrointestinal; D005260:Female; D016481:Helicobacter Infections / Q000150:complications* / Q000175:diagnosis; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010438:Peptic Ulcer Hemorrhage / Q000209:etiology* / Q000382:microbiology; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index